Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o Nord em 1952, quando o Tennis Borussia Berlin era Berlim?
 ###Tabelas: CREATE TABLE tallest_buildings_under_construction (tallest_buildings_under_construction_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Name VARCHAR, City VARCHAR, Height VARCHAR, Floors INT) CREATE TABLE rank_by_number_of_wins (rank_by_number_of_wins_id AUTO_INCREMENT PRIMARY KEY, City & Nation VARCHAR, First Place INT, Second Place INT, Third Place INT, Total Top 3 Placements INT, First Place Winning Year(s) (if applicable) VARCHAR) CREATE TABLE overall_results_in_ipl (overall_results_in_ipl_id AUTO_INCREMENT PRIMARY KEY, Year INT, Matches INT, Wins INT, Losses INT, No Result INT, Tied INT, Success Rate VARCHAR, Position VARCHAR, Summary VARCHAR) CREATE TABLE head_to_head (head_to_head_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Miles [One Way] INT, Home Result VARCHAR, Fans Brought VARCHAR, Away Result VARCHAR, Fans Took VARCHAR, Points Gained INT) CREATE TABLE champions_of_pre-bundesliga_oberligen (champions_of_pre-bundesliga_oberligen_id AUTO_INCREMENT PRIMARY KEY, Year INT, Nord VARCHAR, West VARCHAR, Südwest VARCHAR, Berlin VARCHAR)  
SELECT Nord FROM champions_of_pre-bundesliga_oberligen WHERE Berlin = tennis borussia berlin AND Year = 1952